3069 results about "Linear motion" patented technology

A suspension stabilizer and method are described which may be attached to a bike having front fork suspension to improve handling and reduce rider fatigue. The suspension stabilizer may include a counterweight, a spring assembly and a guide assembly. The spring assembly may be arranged to provide a spring force between the counterweight and the guide assembly to resist linear motion of the counterweight along a guide assembly axis. The counterweight and spring assembly may have a natural motion frequency of 3 to 15 Hertz and may be based on one or more characteristics of the front fork suspension.

A vehicle-mounted GNSS positioning method based on multi-motion model interaction includes: establishing a position-constant velocity (PCV) model and a position-constant steering angular velocity (PCSAV) model for two attitudes of a carrier (i.e., linear motion and turning motion) respectively to obtain a state estimation vector and a state transition matrix of the carrier of the PCV model and the PCSAV model at a previous moment, introducing an interacting multiple model (INM), establishing a heuristic position-velocity filtering (HPV)-IMM model based on the IMM model to achieve an information filtering interaction between the PCV model and the PCSAV model, and obtaining a state estimation vector and an error covariance matrix of the carrier at a current moment, so as to obtain a position and velocity of the carrier at the current moment. The present disclosure solves the problem of low accuracy of a traditional single kinematic model in multi-motion attitude vehicle positioning.

The utility model relates to the technical field of precise driving and positioning, and discloses a linear motor type electric screw which comprises a screw rod, a shell, a driving mechanism, a mechanism seat and a threaded pipe. The driving mechanism is arranged in a cavity defined by the shell and the mechanism base. The driving mechanism comprises a flexible hinge, piezoelectric ceramics and a pre-tightening spring. The flexible hinge comprises a first clamping jaw and a second clamping jaw. And the first clamping jaw and the second clamping jaw provide rotating force for the screw rod under the action of the piezoelectric ceramics. And the pre-tightening springs are used for applying pre-tightening force between the first clamping jaw and the screw rod and between the second clamping jaw and the screw rod. The threaded pipe is used for supporting the threaded rod and being connected with an external mechanism. According to the utility model, the piezoelectric ceramic is adopted for driving and the flexible hinge is combined, so that precise linear motion control is realized, and the touch-free adjusting device has the characteristics of high resolution, high precision and compact structure, and realizes touch-free adjustment of the optical adjusting bracket which is difficult to touch. A plurality of linear motor type electric screws are combined for use, so that two-dimensional or three-dimensional motion control can be realized.

The invention discloses a vehicle positioning method and system, and relates to unmanned driving. According to IMU data and laser radar data, a fast-lio algorithm is used to construct a global prior map; constructing a local point cloud map according to laser radar data collected in real time; recognizing and rejecting dynamic point clouds, and carrying out NDT registration on residual static point clouds and the global prior map to obtain a laser odometer pose; extracting feature points of the camera data by adopting a shii-tomasi algorithm; a Lucas-Kanade optical flow method is used to acquire motion vectors of the feature points; calculating the speed of the feature points according to the motion vector, removing the dynamic feature points with the speed exceeding a preset threshold value, and obtaining the pose of the visual odometer; reckoning the position and course of the vehicle through a CTRV model to obtain a track reckoning result; and carrying out multi-source heterogeneous data fusion by adopting a non-destructive Kalman filtering algorithm. Aiming at the defects of dynamic environment interference and non-linear motion trail modeling existing in traditional open air and mines, the positioning stability of the unmanned vehicle is improved.

According to the electric direct-driven eVTOL rotor control device, a driving motor is an outer rotor motor, a stator of the driving motor is of a hollow structure, and a steering engine assembly is installed on the lower portion of the stator, upwards penetrates through the stator and is in driving connection with a variable-pitch mechanism assembly, so that the deflection angle of blades of a blade handle assembly is adjustable; the intermediate transmission link is reduced, the energy loss is reduced, the transmission efficiency is improved, and the reliability of the system is improved; the rotor mounting seat cylinder is upwards connected with the propeller hub lower cover and downwards connected with the stator mounting seat through a bearing, so that stable and reliable power transmission between the driving motor rotor and the propeller hub assembly is ensured, and vibration and noise are reduced; the anti-rotation rocker arm is arranged between the lead screw nut and the fixed ring sleeve, so that rotation interference is avoided, and the precision and stability of variable pitch control are improved; and the variable-pitch rocker arm is in running fit with the variable-pitch disc, so that the linear motion of the variable-pitch disc can be accurately converted into the deflection motion of the blades, and the accurate adjustment of the pitch angle of the blades is realized.

The invention relates to the technical field of deep hole machining, and provides a multi-axis linkage machining system for drilling and milling the inner wall of a deep hole, which adopts a linear motion device to directly drive a cutter support module, omits a lead screw and other intermediate transmission links, shortens the non-cutting time, has high positioning precision, can improve the machining efficiency, and has lower operation noise and vibration. The processing environment can be improved; according to the workpiece clamping device, a second hollow rotating platform is connected with a chuck, the chuck clamps the workpiece, through program control, the second hollow rotating platform can drive the workpiece on the chuck to rotate and position at any angle, and the requirement for machining the workpiece by a drilling and milling cutter module is met; the problems of time waste, positioning errors and the like caused by secondary clamping are avoided, and the workpiece machining efficiency is improved; a tool bit of the drilling tool module is fed by adopting a variable-diameter structure (a tool bit feeding assembly), and drilling and milling can be carried out on the inner walls of deep hole type workpieces with complex inner hole shapes such as bottleneck holes and stepped holes.

The invention discloses a wind turbine blade semi-coupling aeroelastic modeling method considering nonlinear deformation, and belongs to the technical field of fan simulation calculation. In combination with calculation parameters used by three-party software, establishing a blade structured load model and a blade correction aerodynamic model, calculating an aerodynamic load and a structural load, and superposing: superposing the aerodynamic load, the gravity load and the centrifugal force load of the blade as an external load of a nonlinear structure control equation of the blade, and taking the external load as a calculation parameter; according to the method, the blade nonlinear structure model and the semi-coupling simulation process of the three-party wind turbine simulation software are constructed, and under the same simulation environment and load conditions, the blade nonlinear structure model and the three-party wind turbine simulation software can be subjected to semi-coupling simulation, so that the blade nonlinear structure model and the three-party wind turbine simulation software can be subjected to semi-coupling simulation calculation. The higher-precision non-linear motion response characteristics of the super-long flexible wind turbine blade are calculated, and a good effect can be achieved in the aspects of initial structure design and response evaluation of the large wind turbine blade.

The invention discloses continuous automatic stamping equipment and a stamping method, and relates to the technical field of continuous automatic stamping, the continuous automatic stamping equipment comprises a stamping table, the outer wall of the top of the stamping table is fixedly connected with a top plate, and one side of the top plate is fixedly connected with a positioning table used for fixing when a stamping part is stamped; a positioning assembly is arranged at the top of the top plate, a hydraulic rod is fixedly connected to the top of the top plate, a fixing plate is fixedly connected to the output end of the hydraulic rod, a stamping head is fixedly connected to the outer wall of the bottom of the fixing plate, and a stamping groove matched with the stamping head is formed in the top of the stamping table. The outer wall of the top of the stamping table is fixedly connected with a sliding column. According to the continuous punching device, linear motion of the hydraulic rod is converted into gear transmission and swing of the swing rod through power coupling, impact is relieved through an elastic buffering structure, precise positioning, stable clamping and equidistant displacement of a punching part are achieved through mechanical closed-loop linkage, and high efficiency and stability of continuous punching are guaranteed.

The invention relates to the technical field of transformer coil detection, and discloses a detection device for a transformer coil, which comprises a base frame, the driving mechanism is installed on the base frame and used for providing linear motion in the X direction, the Y direction and the Z direction; according to the scheme, by means of the detection mode that spiral scanning motion is combined with self-adaptive contact and laser ranging, the fatal defects that manual detection is low in efficiency, high in subjectivity and prone to making mistakes and missing detection are overcome, complete three-dimensional shape data of the surface of the coil can be rapidly and accurately obtained, and the detection accuracy is improved. According to the method, local fine defects which are difficult to discover manually can be detected, the reliability and the consistency of detection results are improved, objective and quantitative data support is provided for evaluating the winding quality, the mechanical strength and the long-term operation reliability of a transformer coil, and the manufacturing quality of a transformer and the operation safety of a power grid are guaranteed.

The invention discloses a fitting device for bearing assembly, and belongs to the technical field of bearing machining, the fitting device comprises a device main body used for fixing the whole assembly of the device, and a controller is arranged in the device main body and used for controlling the whole work of the device; the device further comprises a fixed base. A guide groove is formed in one side of the fixed base, and a collecting groove is formed in the bottom of one end of the guide groove through bolts. The device has the beneficial effects that a single power source of the hydraulic cylinder serves as a core, whole-process coupling of blanking, stepping, press fitting, ejection and reset is completed through reciprocating linear motion of the lifting plate, and one-time precise sleeving of a bearing body and a bearing seat in a sliding plate hole site is achieved; when the hole position reaches the press-fitting center, the ejector rod continues to move downwards to complete interference press-fitting, a closed-loop circulation without manual intervention is formed, and therefore the takt time is remarkably shortened, and the equipment utilization rate and the operation safety are improved.

The invention discloses a portable surveying and mapping device for forest resource investigation. The portable surveying and mapping device comprises a storage box, a surveying and mapping instrument and a bracket, a surveying instrument storage cavity and a bracket storage cavity are sequentially formed in the storage box from top to bottom; the upper portion of the surveying instrument storage cavity is of an opening structure, a lifting table and a lifting driving mechanism used for driving the lifting table to do linear motion are arranged in the surveying instrument storage cavity in a sliding mode in the vertical direction, and the surveying instrument is fixedly arranged on the upper portion of the lifting table; the support comprises a mounting plate, a supporting assembly is arranged on one side of the mounting plate, and a connecting assembly is arranged on the other side of the mounting plate. The device is very convenient to assemble and disassemble, can be quickly unfolded and stored during field operation in a forest area, and effectively improves the surveying and mapping operation efficiency during forest resource investigation.

The invention provides a vibration test bench, and relates to a vibration test device, and the vibration test bench comprises a pedestal, and a plurality of vibration frames which are arranged on the pedestal in parallel at intervals and are sequentially arranged on the pedestal from top to bottom; each sliding guide rail is arranged between every two adjacent vibration frames and between the vibration frame on the lowermost layer and the base, and the guide directions of the sliding guide rails are different from one another; each driving mechanism is fixedly connected to the vibration frame located on the lower layer or the base and drives the vibration frame located on the upper layer to do reciprocating rectilinear motion along the corresponding sliding guide rail. Each locking mechanism is arranged between every two adjacent vibrating frames and between the vibrating frames and the base, and each locking mechanism can selectively lock the reciprocating motion of the vibrating frame located on the upper layer; the control unit is in communication connection with all the driving mechanisms and independently controls operation of all the driving mechanisms. The vibration test bench can realize multi-degree-of-freedom movement, and has a broadband vibration frequency / amplitude adjusting function.

The invention discloses a high-precision multi-layer sliding shaft clamp based on a wedge-shaped guide rail structure, and relates to the field of micro-lens array manufacturing and other ultra-precision machining. The problem that in the ultra-precision machining process, when a machine tool is not provided with a guide rail in the vertical direction, centering cannot be efficiently achieved is solved, and the problems that in a traditional centering mode, operation is tedious, the installation and adjustment time is long, the production cost is high, and the machining efficiency is low are solved. A second-stage bottom plate relatively sliding in the ascending direction is arranged above a first-stage bottom plate, and a servo motor transmits power to a transmission mechanism to achieve horizontal linear motion of the second-stage bottom plate relative to the first-stage bottom plate; a third-level bottom plate which relatively slides in the ascending direction is arranged above the second-level bottom plate, a main shaft holding clamp which relatively slides in the direction perpendicular to the ascending direction is arranged above the third-level bottom plate, and the first-level bottom plate and the second-level bottom plate, the second-level bottom plate and the third-level bottom plate and the third-level bottom plate and the main shaft holding clamp are detachably connected through locking pieces. The device is used for achieving vertical centering work of the machine tool spindle.

The utility model relates to the technical field of detection devices, and discloses a collection device for gas detection, which comprises a shell, a sliding plate is slidably mounted in the shell, two rectangular columns are fixedly mounted at the top of the sliding plate, tooth grooves are respectively formed in the right sides of the two rectangular columns, a mounting groove is formed in the right side of the shell, and the tooth grooves are fixedly mounted in the mounting groove. A rotating rod is rotationally mounted on the inner wall of the mounting groove, and the outer wall of the rotating rod is fixedly sleeved with a door plate and a first gear. When a rectangular column moves upwards, linear motion is efficiently converted into rotation motion of a gear through a meshing mechanism of a tooth groove and the gear, and it is ensured that a door plate can rapidly and stably rotate so as to respond to internal air pressure changes. The rotating angle and speed of the door plate can be accurately controlled, and when too much gas is collected in the shell and the gas pressure rises to a certain degree, the door plate can automatically rotate to open the gap.

An assembly including an adapter assembly and an extension assembly for connecting an end effector to an electrosurgical instrument is provided. The adapter assembly includes first and second pusher assemblies configured for converting rotational motion into linear motion and a drive member for transferring rotational motion. The extension assembly includes at least one flexible band assembly for transferring the linear motion from the adapter assembly and a trocar assembly configured for converting rotational motion into linear motion. Also provided is a connection assembly for connecting a first tubular member to a second tubular member.

The invention relates to a six-degree-of-freedom visual inertial odometer method based on double attention and a mixed basis function. The method comprises the following steps: collecting visual image data and inertial data and carrying out preprocessing; obtaining a visual feature vector; extracting an inertial feature vector; generating a final fusion feature; and inputting the final fusion features into a long and short term memory network for time sequence modeling, carrying out nonlinear feature enhancement by using a median Colmogorov-Arnold network, and outputting six-degree-of-freedom pose estimation in a target environment through a full-connection regression layer. According to the method, through a self-adaptive regulation and control mechanism of vision-inertia data, redundant information is compressed, and meanwhile key motion features are reserved; a double attention module is innovatively introduced to improve the feature discrimination ability, the mixed basis function modeling ability of the median Colmogolov-Arnold network is combined to realize the accurate representation of the complex nonlinear motion dynamics, and finally stable and high-precision six-degree-of-freedom pose estimation is achieved.

The two-degree-of-freedom finger mechanism of the five-finger manipulator is suitable for five-finger manipulator equipment of a humanoid robot and serves as a ring finger and little finger module. The robot consists of two parts, namely a finger bending assembly and a finger swinging assembly. The finger bending assembly drives a ball screw nut pair through a driving motor to convert rotary motion into linear motion, and then a ball nut drives an elastic connecting rod and finger joints to achieve bending motion of fingers. The finger swinging assembly drives a bevel gear set through a driving motor, and after the direction of rotating motion is changed, a connecting rod and finger joints are driven through a universal joint to achieve the swinging action of fingers. According to the two-degree-of-freedom mechanical finger, the two assemblies are ingeniously combined to one finger, and the overall size of the mechanical finger is reduced while two-degree-of-freedom movement is achieved. And in combination with the use of the elastic connecting rod, the driving motor is protected, and the action area of the manipulator and the grabbed object is increased.

A drug injection control device has a structure in which a rod lock screw-coupled to a piston rod can make a linear motion under restricted rotation within a rod holder with the rotation of a rod guide and the sub-linear motion of the piston rod. When the injection amount of drug is preset through an injection amount setting module to make a rotational motion with a dose dial in a housing to set the amount of drug to be injected by storing the twisting moment in a torsion spring, in actuating a drug delivery module switchably coupled to the injection amount setting module, the rod lock can make a linear motion by the sliding motion of a lock protrusion through a lock guide formed through the rod holder along the lengthwise direction on the rotation of the rod guide and the sub-linear motion of the piston rod.

A row unit for a seed-planting implement includes a frame, a gauge wheel arm pivotably coupled to the frame, and a gauge wheel rotatably coupled to the gauge wheel arm. Additionally, the row unit includes a wobble bracket configured to engage the gauge wheel arm and a linkage arm coupled to the wobble bracket. Moreover, the row unit includes an actuator, a gearbox coupled to the actuator, and a threaded shaft coupled to the gearbox. In addition, the row unit includes an actuation arm having a first end and a second end opposed to the first end, with the first end forming a hook that directly couples to the linkage arm and the second end coupled to the threaded shaft such that the actuation arm transmits rotation of the threaded shaft into linear motion of the linkage arm.

The invention discloses a foot and leg integrated design foot and wheel matched type multi-degree-of-freedom piezoelectric robot and an excitation method thereof, and belongs to the field of centimeter-level small robots. According to the robot, piezoelectric ceramics are pasted on an integrated base body, and the piezoelectric ceramics are divided into two pieces of Y-direction piezoelectric ceramics and two pieces of Z-direction piezoelectric ceramics; when two paths of sine excitation signals with the phase difference of 90 degrees are applied to the Y-direction piezoelectric ceramic and the Z-direction piezoelectric ceramic respectively, the base body beam bends and vibrates in the horizontal (Y-direction) direction and the vertical (Z-direction) direction, the foot bottom end is driven to synthesize an elliptic track in the YOZ plane, and rotation motion is achieved through friction between the foot end and the ground. Similarly, an elliptical track can be synthesized in an XOZ plane under excitation of different signals, and linear motion is achieved through friction between the foot end and the ground; when a pulse signal is applied to the piezoelectric ceramic, the robot moves at a micron-order micro step pitch. The robot has the advantages of being simple in structure, high in response speed, capable of giving consideration to fast macro motion and precise micro motion and the like, and faces scenes such as large-range precise detection.

The invention belongs to the technical field of side slope protection equipment, and particularly discloses an energy dissipation buffer device for a side slope flexible protection net, the energy dissipation buffer device comprises a connecting rod, a connecting cylinder, an elastic piece and a rope, the connecting rod comprises a traction section and an extending section, the extending section is of a screw rod structure, the connecting cylinder comprises a cylinder body and a disc body, a first through hole is formed in the closed end of the cylinder body, and the elastic piece is arranged in the first through hole; a tooth block matched with the spiral groove is arranged on the first through hole; the cylinder body is arranged on the extending-in section in a sleeving manner, and the extending-in section can penetrate out of the first through hole; when the stretching-in section moves along with the traction section and penetrates out of the first through hole, the tooth block slides in the spiral groove, and linear sliding motion of the stretching-in section is converted into rotation of the barrel; the elastic piece is located in the cylinder, one end of the elastic piece is attached to the stretching-in section, the other end of the elastic piece is attached to the cylinder, and one ends of the ropes are fixed to the traction section. The four core pain points of'one-time consumption, low energy dissipation efficiency, high maintenance risk and concentrated local stress' of a traditional slope buffering technology are effectively solved.

A submarine landslide-seabed-pipeline three-dimensional mechanical analysis experiment system comprises a high-speed landslide driving system, a high-pressure photoelastic observation system, a three-dimensional stress acquisition system and a central controller. The high-speed landslide driving system drives the photoelastic landslide body to achieve high-speed linear motion under the gradient condition through a crawler-type driving mechanism, and the gradient high-speed motion characteristic of a real submarine landslide is simulated. The high-pressure photoelastic observation system comprises a photoelastic seabed, a photoelastic pipeline assembly, a high-pressure sealed cabin and a top hydraulic loading mechanism, and pore pressure distribution and a three-dimensional stress field in the impact process are dynamically developed through the photoelastic effect by combining the refractive index difference of fluid in pores and a photoelastic material with pore pressure data. The three-dimensional stress acquisition system captures multi-angle photoelastic stripes in real time and solves a global three-dimensional stress tensor. The central controller cooperatively regulates and controls all the systems, and control over high-speed movement, the high-pressure environment and material variables is achieved. The system well meets the quantitative research requirements of the submarine landslide disaster-causing mechanism and the protection design.

According to the integrated gate position and limit acquisition method and device, linear motion of the gate is converted into rotation of the gears through the accurate transmission ratio between the gears, then tiny displacement changes are amplified or reduced, the sensitivity and accuracy of gate position monitoring are improved, and the problem that a traditional device is not high in precision is solved. The position of the gate is adjusted according to the height and actual requirements of the gate, a traditional gate level meter and a limiting switch are combined to form an integrated device, the transformation ratio gear, the PLC and the resistance strain type linear displacement sensor work cooperatively, all-directional and high-precision monitoring and control over the position of the gate are achieved, and the safety of the gate is improved. The integrated design not only reduces the size and complexity of the device, but also improves the stability and reliability of the device by optimizing the connection and communication among the parts, and in the aspect of installation, the integrated design enables the overall structure of the device to be more compact, and reduces the installation steps and required space.

Shut-off valves for cryogenic fluids are disclosed herein. An example valve includes a valve body defining a flow path and a valve seat, a bonnet coupled to the valve body and defining a bonnet chamber, a plug, and a stem coupled to the plug. The stem is configured to slide to cause the plug to slide. The valve includes a spindle that includes external threads. The spindle is configured to move along a longitudinal axis of the bonnet as the spindle is rotated about the longitudinal axis via the external threads to cause the stem to slide linearly along the longitudinal axis. The valve includes a pivot ball positioned between and operatively coupled to the stem and the spindle. The pivot ball is configured to translate linear and rotational movement of the spindle into linear movement of the stem and the plug.

A measurement system for a focal distance measurement of an optic includes: a translation stage including a base and platform configured to translate in linear motion relative to each other in an automated manner driven by a linear actuator; a reference material disposed on the translation stage and having a surface opposite the optic to be measured; a measuring device configured to measure a gap between the surface of the reference material and a distal tip of the optic in an automated manner; a spectrometer in optical communication with the optic; and a controller configured to operate the translation stage, the measuring device, and the spectrometer and to determine a focal distance of the optic based on a spectral characteristic of a measurement spectrum and on a final gap between the surface of the reference material and the distal tip of the optic at which the spectral characteristic is determined.

The invention provides an ocean carrier follow-up wave power generation device which comprises a cylindrical linear generator, a linear motion sliding table, a bistable motion unit and a steering adjusting unit, the cylindrical linear generator is placed on the linear motion sliding table, and the whole motor can slide; the two sides of the upper sliding rail are fixedly connected with an upper supporting rod frame in the bistable motion unit, the lower sliding rail is connected with a bistable motion frame in the bistable motion unit, and the bistable motion unit is placed on the steering adjusting unit to form the whole structure of the power generation device. The device can be mounted on various suitable ocean carriers, and the power generation efficiency of the power generation device is improved by utilizing a bistable motion principle; by combining a cylindrical linear generator, a linear motion sliding table, a bistable motion unit with a bistable motion spring as a main tool and a steering adjusting unit, bistable motion power generation based on a cross potential energy trap is achieved, the energy capture efficiency when the wave energy frequency is low is improved, and the power generation adaptability of the device to different sea conditions is improved.

A multi-axial spine testing system includes a physiological motion unit (PMU); a uni-axial test frame having an input; and a fixture configured to be attached to the test frame and facilitates a plurality of primary motions of one or more of the PMU and the fixture. The plurality of primary motions includes a linear motion of the input and a rotational movement of an output. The fixture has an upper assembly directly or indirectly coupled to the input. The upper assembly transfers the linear motion (Tz) of the actuator to the rotational movement (Rx) of the output. The upper assembly and lower assembly apply a bending moment (MX) and an axial compression (Fz) to the PMU. An external transducer collects data related to or generated by at least the plurality of primary motions. The fixture simultaneously provides the bending motion and axial compression to the PMU.

The utility model discloses a pipe coiling device, which belongs to the technical field of pipe coiling, is used for spiral pipe coiling of steel pipes, and comprises a support frame, a linear motion mechanism, a rotary motion mechanism, a limiting mechanism, a central shaft sleeve and a locking mechanism, one end of the steel pipe is connected with one end of the central shaft sleeve through a limiting mechanism and is locked through a locking mechanism; the linear motion mechanism and the rotary motion mechanism are used for driving the center shaft sleeve to do linear motion and rotate around the center shaft at the same time, and spiral pipe coiling of the steel pipe is achieved. The pipe coiling device can effectively solve the problems that in the prior art, a spiral pipe machined by a traditional pipe coiling machine is large in coaxiality deviation, and the strict requirement of high-precision equipment for pipe precision is difficult to meet; the steel pipe is easy to pop up accidentally in the machining process, and serious potential safety hazards are caused to operators and peripheral equipment.

The utility model relates to a combined guide rail mechanism and a vehicle sliding-out system.The combined guide rail mechanism comprises a guide rail, a first guider and a second guider, multiple rows of parallel circulating balls are arranged in the guide rail, and the first guider and the second guider do reciprocating infinite circulating linear motion on the guide rail; a bearing object can do high-load and high-precision linear motion along the first guider or the second guider. A vehicle box sliding-out system comprises a combined guide rail mechanism, a driving device, a rack frame, a supporting frame, a bearing box and a sliding-out box, the supporting frame is fixed to a vehicle body, the bearing box slides back and forth at the lower end of the supporting frame through a long-strip-shaped opening, a chassis on the lower portion of the vehicle body does not need to be disassembled, and only the supporting frame needs to be fixed to the vehicle body. And the whole sliding-out box body can be arranged at the opening of the vehicle body. Two-stage stretching can be achieved, the using space of a vehicle is increased, and the device is neat, attractive and convenient to mount and dismount.